System Messages
The following VNAV system messages that may be displayed in the messages window at the bottom of the display.
|
VNAV System Message |
Comments |
|---|---|
|
UNABLE VNAV Excessive cross-track error. |
The current cross-track exceeds the limit, causing VNAV to be temporarily unavailable. |
|
UNABLE VNAV Excessive track angle error. |
The current track angle error exceeds the limit, causing VNAV to be temporarily unavailable. |
|
UNABLE VNAV Parallel course selected. |
VNAV is not available while a parallel course is active. |
|
UNABLE VNAV Reverted to PIT. |
This message is displayed when PATH has reverted to Pitch Hold Mode. This would happen because of an overspeed condition, a vertical discontinuity, or invalid vertical deviation. |
|
ARM VNAV DESCENT Reset altitude preselect to arm descent. |
The flight plan calls for a descent, but the Selected Altitude needs to be reset. No change in altitude can be made unless allowed by the Selected Altitude. |
|
ARM VNAV CLIMB Reset altitude preselect to arm climb. |
The flight plan calls for a climb, but the Selected Altitude needs to be reset. No change in altitude can be made unless allowed by the Selected Altitude. |
|
DISABLE GS TO ARM CLIMB Press NAV button to enable VNAV track change. |
While the GS (glideslope) vertical mode is armed, the flight director will not arm a climb mode. GS must be removed before VNAV can arm a climb mode. |
|
DISABLE GP TO ARM CLIMB Press NAV button to enable VNAV track change. |
While the GP (glidepath) vertical mode is armed, the flight director will not arm a climb mode. GP must be removed before VNAV can arm a climb mode. |
|
UNABLE VNAV ALTITUDE Cannot meet VNAV altitude constraint. |
Based on the current rate of climb or descent, the next flight plan altitude constraint will be exceeded (VNAV Mode remains active). |